Gear puller



H. J. KNIGHT June 7, 1927.

GEAR FULLER Filed Nov. 21, 2

mvEmToR HENRY Jonn KNIGHT ATTQRH rzYs Patented June 7, 1927.

UNITED. S TE HENRY JOHN KNIGHT, OF VANCOUVER, BRITISH COLUMBIA, CANADA.

GEAR PULLER.

Application filed November 21, 1925, Serial No. 70,570, and in GanadaApril 25, 1925.

My invention relates to improvements in gear pullers the objects of which are to provide means for gripping a gear and for removing it from the shaft to which it is fitted, a further object is to provide a yoke upon which grips of varying shapes and sizes may be endwise movable parallel to each other so that the strain upon the several parts shall be equalized.

The invention consists essentially of a yoke having opposed and inclined arms, through which a drift bolt is projected and pairs of drums'adjustable upon the arms for gripping a gear to remove it from its shaft, as will be more fully described in the following specification in which The drawing is a general view of my in' vention.

The numeral 1 indicates generally a yoke in which 2 is a boss having a vertical bore 3 and two or more radially disposed arms 4 extending upwards and outwards, these arms are preferably rectangular in cross section, the Width lengthwise of the puller being greater than the transverse dimension.

I have found that by providing the arms at an angle of 75 degrees from the axis of the puller that a suitable inward movement of the grips is provided to prevent any tendency of slipping off the gear.

Extending through the bore 3 of the boss 2 is a threaded bolt 5 having a hexagon head 6 at the outer end and hardened point 7 at the opposite end which is adapted to seat in the centre of. the gear shaft 8. A nut 9 is disposed upon the bolt 5 and is adapted to bear against the underside of the boss 2.

The numeral 10 indicates a plurality of grips each of which is provided at its upper end with a head 11, which is adapted to slide upon a yoke arm 4 and which is bent over at its lower end as at 12 to grip the inner face of the gear 13. It will be obvious that the grips 10 are formed in varying shapes in order to conform to the varying shapes and conditions of the wheels to be removed.

Having thus described the several parts of my invention I will now briefly explain its use.

A pair of grips 10 is first selected which is suited for the gear to be pulled and the situation in which the pulling is to be effected, they are then put into place upon the yoke arms 4, the nut 9 is run down the bolt to a suitable distance to permit of the puller being put into position with the point 7 of shaft 8 and the bent over ends 12 of the the bolt 5 in contact with the end of the I grips under the face of the gear 13. The

bolt is then turned to draw the nut 9 which is held against rotation, into firm engagement with the boss 2 of the yoke, which action causes the heads 11 of the grips 10 to slide towards the bolt so that the outer ends" of the grips engage the periphery of the gear, when the further tightening of the bolt exerts a pull through the grips to slide the gear lengthwise of the shaft to remove it.

Should it be found that the gear is so firmly secured that it cannot be freely re- 'moved by tightening the bolt alone, smart hammer blows are applied to the head 6 of the bolt to drift the shaft through the gear,

while taking up the slack by turning the bolt in the nut 9 as it develops.

1n the event of it being necessary to remove a gear orother fitment from a shaft, where the grip must be effected upon the interior of the periphery, the yoke would be inverted and suitable grips used, the grips would then have a tendency to spread apart to grip in an exactly opposite manner to that shown in the drawing.

What Iclaim as my invention is: 1. A gear puller comprising a yoke presenting a central body portion having a non-threaded bore extending therethrough and a pair of arms rigidly connected at their inner ends to said central body portion and inclining upwardly therefrom, a pair of gear grips formed at one end to engage a gear and provided at the opposite ends with inclined transverse openings slidably receiv ing the arms of the yoke therethrough, a threaded member passing loosely through the bore of said yoke and a nut threaded on said member and engageable with one side of the yoke.

2. A gear puller comprising a yoke presenting a central body portion having a bore extending therethrough and a pair of dia-. metrically opposed arms inclining upwardly from said central body portion and having their inner ends rigidly attached thereto, a

pair ofgear grips formed at one end to engage a gear and provided with apertures slidably receiving said arms therethrough, a member passing ]oose ly through the bore of the yoke and adapted to engage a gear shaft and a nut threaded on said member and engageable with the yoke to move the latter and the grips longitudiln ally of said member to'exert a pull on agear engaged by said grips. 1 l Dated at Vancouver, B. (1, this 4th day of Nov., 1925.

HENRY J OHN'KNIGHT. 

